BildTel 001 » History » Revision 16
Revision 15 (laforge, 10/30/2023 08:44 PM) → Revision 16/27 (laforge, 10/30/2023 08:47 PM)
{{>toc}}
h1. BildTel 001
The Telekom-branded *BildTel 001* was likely the first commercially available ISDN video phone in Germany.
{{thumbnail(20231028_114259.jpg,size=400)}}
{{thumbnail(20231028_114402.jpg,size=400)}}
{{thumbnail(isdn-bildtelefon-picture-alliance-zb-matthias-hiekel-11764519.jpg,size=400)}}
(Only digital marketing picture I could find online, courtesy of Picture Allianze / Matthias Hiekel)
h2. Architecture
The system consists of the following parts:
* A TV screen with built-in [[BTX__Prestel__Videotex__Minitel|BTX]] decoder (inherited from [[LOEWE_Multitel_TV10]])
* A keyboard + phone-receiver combo (inherited from [[LOEWE_Multitel_TV10]])
* A _desktop-computer-like_ box called the Codec (containing the actual ISDN video telephony part, implemented by AEG/OLYMPIA)
* A video camera
The BTX Terminal [[LOEWE_Multitel_TV10]] was used as the "user interface" for the device, adding the _codec_ box to turn it into a video phone.
h3. Codec unit
{{thumbnail(20231028_114437.jpg,size=400)}}
{{thumbnail(20231028_120250.jpg,size=400)}}
{{thumbnail(20231028_120314.jpg,size=400)}}
{{thumbnail(20231028_120334.jpg,size=400)}}
{{thumbnail(20231028_120934.jpg,size=400)}}
{{thumbnail(20231028_120943.jpg)}}
The Codec unit ("Bildeinheit") consists of a variety of different circuit boards:
* 1x power supply
* 4x "mainboards" stacked on top of each other (two sandwiches of two PCBA)
** boards have a number of DIN 41612 slots for plug-in cards
* 9x CODEC ADSP boards plugged into slots of the top two mainboards
* 1x OUTDIG sandwich, consisting of two PCBA plugged into slots of the top mainboard
** this is the TV output board, generating and digital-analog-converting analog TV signal
* 1x FIXME sandwich, consisting of two PCBA plugged into slots of a mainboard
** this is the camera input board, receiving and digitizing the analog TV camera signal
h4. AEG-OLYMPIA CODEC ADSP
This board exists 9 times in total. There are no visible differences between the boards; also the label on the GAL is identical.
PCB Marking: @1601914L11T@
Connector Marking: None
{{thumbnail(20231030_105751.jpg,size=400)}}
{{thumbnail(20231030_105725.jpg,size=400)}}
{{thumbnail(20231030_105648.jpg,size=400)}}
|ADI ADSP-2101|Digital Signal Processor|
|VX-8111 10.0000 MHz|Crystal Oscillator|
|GAL20V8A (4012-001/2)|GAL|
|2x IDT 7201SA25J|FIFO|
|2x IDT 7202SA25J|FIFO|
|3xCY7C199-45VC|RAM|
* GAL image: attachment:bildtel001-aeg_olympia_codec_adsp_4012-001_2_GAL20V8A.jed
h4. AEG-OLYMPIA OUTDIG
PCB Marking: @2401913L1T@
Connector Marking: @35.103-3030.2 SN. 3051@
top PCBA:
{{thumbnail(20231030_110051.jpg,size=400)}}
|Brooktree Bt101|Triple 8-bit VIDEODAC|
|Xilinx XC2018-100|FPGA 100 CLBs, 1000 Gates|
|S-Data SXO-300C 27.00000 MHz|Crystal Oscillator|
|3x IDT 7201SA25J|FIFO|
bottom PCBA: FIXME
h4. AEG-OLYMPIA INANA
This is the analog input board.
PCB Marking: @0202914L1T@
Connector Marking: @35.103-3023.8/01@
h4. AEG-OLYMPIA INDIG
This is the digital input board, containing the video ADC and support circuitry
PCB Marking: @0202915L1T@
Connector Marking: @35.103-3020.2/01@
|Brooktree Bt253KPJ|Color Video ADC|
|Xilinx XC3030-70|FPGA|
|DOC31CC 27.000M|Crystal Oscillator|
|3x TI TLC272CP|OpAmp; likely buffers for analog R/G/B|
|0900-002/2|SPI flash for FPGA bitstream?|
|3x QSL QS8201-15JR|512x9 FIFO|
h3. TV Camera
{{thumbnail(20231028_115010.jpg,size=400)}}
h3. TV / BTX Unit
{{thumbnail(20231028_114503.jpg,size=400)}}
{{thumbnail(20231028_132851.jpg,size=400)}}
{{thumbnail(20231028_133058.jpg,size=400)}}
{{thumbnail(20231028_133103.jpg,size=400)}}
{{thumbnail(20231028_133211.jpg,size=400)}}
{{thumbnail(20231028_133255.jpg,size=400)}}
{{thumbnail(20231028_133336.jpg,size=400)}}
h4. BTX decoder
* EPROM image: attachment:bildtel001_tv10_btxdecoder_16772_074_349_27C010.bin
h3. Keyboard/receiver unit
{{thumbnail(20231028_114558.jpg,size=400)}}
{{thumbnail(20231028_114639.jpg,size=400)}}
{{thumbnail(20231028_141412.jpg)}}
{{thumbnail(20231028_142128.jpg)}}
{{thumbnail(20231028_142246.jpg)}}
{{thumbnail(20231028_142251.jpg)}}
Actual Cherry keyboard PCBA after full disassembly, ultrasonic cleaning of all keycaps and lots of isopropanol on the PCB, removing what might be decades old coke residue:
{{thumbnail(20231029_093033.jpg,size=400)}}
* EPROM image: attachment:bildtel001_keyboard_74E84.251U22g_1.0.0_010389_M2764A.bin
h2. Connections
h3. Codec unit
* connects to ISDN basic-rate S0 interface using 8P8C/RJ45 plug
* has two proprietary connectors for attaching video cameras
* has two SCART connectors (one for audio/video output to the TV)
* has a TAE jack for attaching an analog phone for the audio port (connected to the combined keyboard/receiver unit by default)
* has another TAE jack (purpose unknown)
* has a V.24 interface on a SUB-D 9 connector which connects to the built-in BTX decoder of the TV unit
h3. TV Camera
* connects to the Codec unit using a proprietary high-density connector that appears to carry both video and power
h3. TV unit
* has an RF input for TV broadcast signals (PAL)
* has a SCART input for baseband audio/video from peripherals (like the Codec unit)
* has a DIN speaker output for attaching an external speaker
* has a built-in BTX decoder with
** an unused DIN port intended to connect to the [[DBT-03]] BTX-Modem (not used in the ISDN video application)
** an unused centronics port
** an auxiliary V.24 port on a DIN connector interfacing the SUB-D 9 of the Codec unit
h3. Keyboard/receiver unit
* has a cable with TAE connector attached (connects to codec unit)
h2. Further Reading
* "Thread on the fediverse covering the BildTel 001":https://chaos.social/@LaF0rge/111317641831468838
